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αž€αžΆαžšαž•αŸ’αžŸαž–αŸ’αžœαž•αŸ’αžŸαžΆαž™αžŸαŸ†αž‘αŸαž„ (Sound propagation)

1 books Β· 196 questions

1 books196 questionsαžαŸ’αž˜αŸ‚αžš (Khmer)All subjects
αž€αžΆαžšαž•αŸ’αžŸαž–αŸ’αžœαž•αŸ’αžŸαžΆαž™αžŸαŸ†αž‘αŸαž„ (Sound propagation) Β· Happy Quiz